Salesforce CRM Java Developer Mock Interview

Practice 20 Salesforce CRM Java Developer interview questions covering Apex, integration patterns, and backend architecture.

Question 13 of 20

Can you tell me what a Compare and Swap algorithm is and how you use it when coding in Java?

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William Swansen

William Swansen has worked in the employment assistance realm since 2007. He is an author, job search strategist, and career advisor who helps individuals worldwide and in various professions to find their ideal careers.

This is a more complex technical question, which asks you to define a term and then discuss how it is used when creating a Java program. Regardless of whether a question is simple or complex, it would be best to keep your answer brief and to the point. The Salesforce interviewer will either ask for more information or move on to the next topic.

William Swansen

"Compare and Swap is a type of instruction which helps to synchronize threads in a multi-threading environment. The way it works is to examine the content of a memory location and, if it matches another location, it modifies the value of the content and creates a new value. This prevents the content from being used by another thread and a write operation failing."

Anonymous Answer

Compare and swap is a technique used when working with multi-threaded environments. It can be used to compare a variable's value to an expected value and if the values match, it will swap the variable's value for a new value. This can prevent multiple threads from executing the critical section of code simultaneously.

Marcie's Feedback

Interesting! You have provided a thorough definition and explanation of a Compare and Swap algorithm. Have you ever personally used this type of algorithm before?

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